Condenser-type suspension-insulator.



S. S. SONNEBORN. coNoENsER TYPE SUSPENSION lNsuLAToR.

APPLICATION FILED FEB. l0, 1917.

1,247,343 .v Patented Nov. 20,1917.

i of Brooklyn,

SOL S. SONNEBOBN, OEBROOKLYN, NEW YORK.

,CONDENSEB-TYPE SUSPENSION-INSULATOB.

Specication o! Letters Patent.

Patented Nov. 20, 1917.

Application led February 10, 1917. Serial No. 147,735.

To all whom it may concern:

Be it known that I, SoL S. SoNNEoRN, a citizen of the United States, and a resident county of Kings and State of New York, have invented certain new and useful Improvements in Condenser-Type Suspension-Insulators, lowing specification. V

This invention relates to suspension insulators. The object of the invention is to combine in one structure means for distributing electro-static stress in an effective and eiicient manner; providing high puncture strength; providing adequate leakage surface; providing dielectric contour lines in substantial conformity to the flow lines of dielectric stress; providing extreme mechanical strength; and many special comi binations of these desirable features.

The general broad object of the invention is to provide a highly eicient and economical insulator for high-potential use.

The invention willfbest be understood in connection with the following claims when studied in connection with the illustrative embodiments described in the following specification, embodiments shown in the drawings which form part hereof. In the drawings Figure 1 is a front elevation partl in section and with parts broken away, s owing one em`-, bodiment of the invention; Fig. 2 is a bottom plan View taken along line II--II of Fig.-i l; Fig. 3 is a vertical section taken along line III-III of Fig. 1; and Fig. 4 is a fractional sectional elevation showing modifications.

An inverted cup-shaped metallic member 1, terminating in a beading 2 of curved cross-section, provides suitable connecting means such las the perforated lugs 3, and has perforations 4 to accommodate the tiebolt a. In Figs. 1, 2, and 3 the tie-bolt (L comprises a central strength-giving member 5, preferably in the form of a steel bolt, surrounded by a sleeve 6 of insulatingmaterial such as mica-board, which projects beyond the ends of the member 5. In Fig. 4 the bolt a comprises a single member-7 of strong dielectric material such as compressed fiber.

The bolt a mechanically locks in osition the eye-bolt 8, the eye-portion 9 o which has a cylindrical bore preferably fitted with a plurality-- of overlapping cylinders 10, 11 and 12 of high dielectrlc insulating material such as mica-board.

set forth in the fol-y which refers to the illustrative.

A sheet metal canopy 13 having perforations 14 is snapped over the cup-shaped vmember 1 to rest on the ledge 15, formed by a circularchanned in the outer wall of the cup portion 1 and beneath the overhanging ledge 16.

Suitable moldable insulating material such as electrose is forced and molded about the various parts of the insulator within the cup 1 and above and below and through the perforations 14 ofthe metal canopy 13, so as to form a petticoat portion 20, the under surface of which may be shaped into ridges 2,1, 22. In the construction of Fig. 1, the metal canopy 13 extends out beyond the petticoat-20 of insulating material and is finished by a beading 23.

The eye-bolt 8 has a collar 24 located adjacent the lower termination of the insulating material from which the insulator is molded. Its eye-portion 9 has a configuration approximately parallel to the inner face of the cu 1, to the end that all contour lines of t e dielectric may correspond approximately to the flow lines of electrostatic stress. This is not exactly true for the contour lines within the opening of the eye in the bolt 8, but at this locality an additional dielectricvstrength both against surface leakage and puncture is provided by the overlapping plural sections of tubular insulating material. The overhangingof the tube 4 beyond the end of the bolt- 5 likewise necessitates a long leakage surface for any current whichrmay tend to iow from the metallic bolt 5 to the cu 9. lIn the construction shown it is seen that the path opposed to current flow from bolt 8 to bolt 5 and thence to cup 1, has interposed in it iive distinct dielectrlc barriers, while the direct path from the eye 9 to the cup 1 is opposed by a barrier of electrose, the contour lines of which correspond almost exactl to the flow lines of electro-static stress. n this manner, all the parts which cannotbe properly designed to give 'maximum dielectric strength for the amount. of material used are so designed as to give more than adequate 'dielectric strength in the locality otherwise subjected to non-uniform electrostatic stress.

In Fig. 4 two modifications are illustrated, any oney or both of which may form a part of an alternative or alternative embodiments like Fig. 1. In Fig. 4 the metallic canopy 13, mstead of projecting outwardly beyond the petticoat 20, is wrapped about the 'ridge 2l to form a beading 30. Also in this figure is to beA noted that tirely of dielectric material, which might eliminate the necessity or the desirability of the,l plural over-lapping tubular sections of insulation 10, 11 and 12.

The insulator construction illustrated is one which adapts itself readily for use where high condensance is to be provided or to be built up. To this end the metal canopy 13 plays a large part `and also structurally strengthens the entire structure.

What is claimed and what is desired to be secured by United States Letters Patent is:

l. A high-potential insulator comprising a conducting terminal having a Haring metal canopy; and a petticoat of insulating material, said metal canopy being embedded in said petticoat and serving to distribute electro-staticstress and also to reinforce said petticoat.

2. A high-potential insulator comprising v a conducting terminal having a flaring metal canopy provided with perforations; and a petticoat of insulating material, said metal canopy being embedded in serving to distribute electr`o-static stress and also to reinforce said petticoat.

3. A high-potential insulator, comprising a conducting terminal having a flaring metal canopy; and a petticoat of insulatin material, said metal canopy being embegded in said petticoat throughout its central portion and havin its outer ,margin exposed and serving to ig'listribute electro-static stress and also to reinforce said petticoat.

4. A high-potential insulator comprising a cup-shaped metallic terminal; a Haring sheet metal canopy connected to said termiing a filling the bolt a is shown en-V petticoat adjacent said canopy, wherebyvopenin s;

said petticoat and.

nal ;yand a body of insulating material formfor said terminal and a flaring electro-static stress is distributed.

5. In a high-potential insulator the combination of a condenser-partition in the form of a metal fabric having openings, and an embedding wall of insulating material, whereby moldable dielectric may be built up into an insulator of the con'denser type with the layers of dielectric on opposite sides of the partition substantially forming an integral part of the whole.

In a suspension insulator, an eye-bolt,

a terminal having two openings on opposite sides ofthe eye of said eye-bolt; a tube of insulating material passing through said eye and projecting "outwardly from both 'said and a reinforcing metal rod in said tu e but terminating short of its ends.

7. A high-potential strain insulator having eye-bolt and perforated yoke metal terminals; a metal tie-pin locking said eyebolt terminal to said perforated yoke terminal; a filling of insulating material between said yoke-terminal and said eye-bolt terminal; and one or more sleeves of higher dielectricvalue than said filling interposed between said bolt and the adjacent parts of one or more of said terminals.

8. A high-potential strain insulator comprising two metal terminals; a tie-bolt for ocking said terminals together; and a plurality of overlappin sleevesl of insulating material interposed iet'ween said bolt and one of said terminals.

In witness whereof I have signed m name to this' specification, this 26th day o January, 1917.

SOL S. SONNEBORN. 

